The previous automatic transmission car, it has only one gear - D gear, car owners in the high speed, can only choose D gear driving, but with the owner of the car driving mode pursuit of diversification, automotive engineers also set up S gear for the vehicle, S gear as the name suggests is the sports gear, in order to better highlight the driving dynamics of the vehicle, owners will choose the sport mode when running high speed, this driving method is correct or not? When driving at high speeds, should the owner choose D gear or S gear?
The difference between D gear and S gear
First of all, to introduce the difference between D gear and S gear, D gear is normal gear, when the owner hangs up D gear, the transmission can be normally raised and lowered, the output torque of the engine is biased towards normalization, the tuning of the engine and the transmission is more inclined to the equalization of "power" and "fuel consumption"; S gear is the sports gear, S is the abbreviation of the English letter "sport", when the vehicle switches to S gear, the torque output of the engine is more surging and the response of the engine is more rapid. And there is a delay in the transmission upshift (the corresponding transmission gear is 5 gears when the D gear is 50km/h, and the S gear 50km/h may be 4 gears), but the downshift becomes more active, the owner slightly presses the accelerator, the transmission will downshift, and the transmission shift speed will also increase. In short, S gear is to improve the power of the vehicle by sacrificing the fuel consumption of the vehicle.
After introducing the difference between S gear and D gear, we should be able to clearly understand that under S gear conditions, the fuel consumption of the vehicle is higher, but the power is also stronger, in the D gear, although the power of the vehicle has been reduced, but the fuel consumption of the vehicle has become more economical.
High-speed driving condition analysis
Let's recall the high-speed driving conditions, just enter the high-speed, the owner will first enter the ramp, after rapid acceleration on the ramp, the owner can be merged into the high-speed, on this road, the owner needs to accelerate sharply, the higher the speed of the vehicle, the better the safety of the owner when merging into the high-speed, in order to increase the dynamics of the vehicle, the owner can choose the S gear acceleration; after entering the high speed, most of the vehicles are in constant speed working conditions, driving at a uniform speed between 100 and 120km/h, only in the case of overtaking, The owner needs to step on the accelerator, but the owner's requirements for the acceleration ability of the vehicle are not very high, in this case, the owner can choose D gear to drive.
I don't know if you have found that if your vehicle is equipped with 8AT/9AT, CVT transmission, high-speed 120km/h fixed speed driving, S gear corresponding to the engine speed is higher than D gear, that is because, S gear in order to highlight the sense of acceleration of the vehicle, engineers deliberately increased the transmission transmission ratio corresponding to 120km/h speed, 8AT transmission in S gear can only rise to 7 gears, 9AT transmission in S gear can only rise to 7 gears or 8 gears, CVT transmission in the S gear transmission ratio is also deliberately improved, the higher the transmission transmission ratio, 120km / h speed corresponding to the engine speed is higher, the engine output torque is also greater, and its responsiveness is also better, which will also invisibly increase the fuel consumption of the vehicle. According to the survey, when driving at high speed, the fuel consumption corresponding to the S gear is 0.5 ~ 1.5L/100km higher than the D gear, and now it is the peak period of fuel consumption, 95 gasoline has come to the 9 yuan era, every 100 kilometers of running, the fuel consumption of the S gear will cost 10 yuan more than the D gear.
In summary, when the owner is driving at high speed, if it is a rapid acceleration condition, such as ramp speeding, high-speed overtaking, the owner has a higher demand for vehicle power, at this time the owner can choose S gear; but if it is only fixed speed, in order to reduce the fuel consumption of the vehicle, the owner can choose D gear.